All the things You Want To Know About Pre-Emergent Herbicide

In the event you’re trying to improve your spring gardening toolkit and haven’t but tried pre-emergent herbicides, this can be a superb place to start out. Pre-emergent herbicide is a kind of weed killer that works by stopping seed germination and is barely efficient when utilized earlier than weeds seem.

How Does Pre-Emergent Herbicide Work?

Pre-emergent herbicides work by making a chemical barricade within the high layer of soil that coats seeds and prevents them from rising roots and shoots. Although pre-emergent herbicides work on many kinds of garden weeds, they’re mostly used to cut back the presence of crabgrass. The energetic elements in herbicide are dithiopyr, isoxaben, and prodiamine, which helps with a number of weeds and crabgrass management.

What To Purchase

To determine which kind of herbicide weed preventer to purchase on your summer time annual and winter annual weeds, you’ll wish to be aware of what kind of current weeds are inclined to develop in your garden. The identical number of weeds usually pop up yr after yr, so paying attention to the kinds of weeds that sprout in your garden may also help you determine which kind of pre-emergent herbicide to purchase the next season. Your native backyard retailer may also help you establish which herbicide will goal your weeds.

Take into account that no pre-emergent herbicides can goal all sorts of weeds. Some pre-emergent herbicides kill a broad array of widespread garden weeds whereas others goal particular weeds like crabgrass or chickweed.

To extra precisely goal the spectrum of weeds current in your garden, Oregon State College recommends utilizing two kinds of herbicide, comparable to one which controls turfgrass weeds and one other that controls broadleaf weeds.

You’ll additionally have to resolve whether or not you wish to use a liquid or granular pre-emergent herbicide. Liquid herbicides must be combined with water (if bought in a concentrated kind) and utilized with a sprayer, which you’ll both purchase or hire. With granular varieties, you’ll be able to apply by hand or with a spreader or shaker bag.

Water your garden inside a couple of days of fall or spring software for the herbicide to be efficient, because the water permits the herbicide to unfold deeper into the soil. Most pre-emergent herbicides are chemical-based, however a couple of pure and natural varieties do exist. Earlier than making use of, know that diluting the herbicide greater than the really helpful quantity can drastically cut back its efficacy. For that reason, it’s essential to use the herbicide in accordance with its instructions.

When To Apply a Pre-Emergent Herbicide

Apply a pre-emergent herbicide within the early spring, a couple of weeks earlier than annual weeds usually seem.

In the event you’re new to the area or just uncertain when garden weeds first pop up, a superb rule of thumb is to use your herbicide after the climate falls between 65 and 70 levels Fahrenheit for at the least 4 days in a row. You may as well search recommendation from a neighborhood gardening middle or college cooperative extension.

Many individuals apply a pre-emergent herbicide for a second time about six to eight weeks after the primary software. Learn the label to seek out out extra about when to greatest apply.

Fall Pre-Emergent Software

Whereas it’s commonest to use pre-emergent herbicide within the spring, it’s also possible to apply it within the fall months. The temperature ought to nonetheless drop under 70 levels Fahrenheit earlier than making use of, which is usually in September or October.

Whereas it isn’t essential, you’ll be able to apply a pre-emergent herbicide twice a yr — within the spring and fall — to assist stop weeds from taking up. I do that with my garden, and it appears to work effectively in stopping weeds from coming again.

Issues To Preserve in Thoughts

  • Don’t wait too lengthy — This number of herbicides is not going to be efficient if weeds emerge earlier than software. It additionally received’t be efficient if utilized too early, as rain may cause the herbicide to be washed away or journey too deep into the soil. However in case you’re actually uncertain of when to use your herbicide, it’s higher to use too early than too late.
  • Preserve undisturbed soil — Aerating your garden or cultivating it in any approach can disrupt the highest layer of soil the place the herbicide has created a barrier, within the course of disrupting the barrier. After making use of pre-emergent herbicide, keep away from digging or doing the rest to the highest layer of soil.

Consumers Information: Pre-Emergent Herbicides

There are various pre-emergent herbicides available on the market, so it may be troublesome to decide on the precise pre-emergent product on your garden. When buying the very best pre-emergent herbicide for you, there are some components to pay attention to.


The price of a pre-emergent herbicide is usually a large deciding issue when selecting the best product. Whereas a $100 bottle of herbicide looks as if a giant expense at first, it’ll last more and canopy extra space than a $25 small bag. Paying extra for the product in bulk can prevent cash in the long term, as you don’t have to preserve going out and buying extra herbicide.


Relying on the place you reside, you may have to look into totally different choices. In the event you stay in an space that will get a variety of rain, a liquid pre-emergent will work sooner and keep within the soil longer. There are some granule pre-emergents, like Scotts pre-emergent weed management, that work effectively with rain or snowfall, so it’s best to look into the specifics earlier than buying a product.


In the event you use a liquid pre-emergent herbicide, you have to to additionally buy a pump sprayer on your herbicide purposes so you’ll be able to evenly coat your garden. pump sprayer can value as much as $100, so it is best to preserve the value of extra gear in thoughts earlier than buying a product.


Is pre-emergent a weed killer?

Pre-emergent doesn’t kill weeds which have already come out of the bottom. As an alternative, it prevents weed seeds from germinating, stopping any new weed development.

Is pre-emergent value it?

Pre-emergent is thought to be efficient in stopping sure weeds from overtaking your garden. In the event you correctly apply it, it’s positively value it, because it prevents weeds from spreading. It’s a good crabgrass preventer, and in addition works effectively in stopping dandilions, fescue, spurge, bluegrass, foxtail, and nutsedge from spreading.

What’s the distinction between pre-emergent and post-emergent?

Whereas pre-emergent implies that it prevents weeds from rising inside the soil, post-emergent herbicide implies that it kills the weeds after they’ve already come out of the bottom.

Not Taken with DIY Landscaping?

As a house owner, garden care is extra than simply weed management. The greatest garden care providers, like TruGreen, supply extra providers like fertilization, weed management, aeration, seeding, and extra. Trugreen is our high really helpful supplier for all your garden care wants. To get a free quote, fill out this way or name 1-866-817-2172.

To be taught extra: TruGreen Evaluate

Examine Garden Care Providers


Weeds not solely look dangerous, however they make it troublesome so that you can develop the crops that you really want. Pre-emergent weed management is an inexpensive and efficient approach to deal with weeds that take over your garden. Nevertheless, DIY landscaping isn’t for everybody. Whether or not you select to handle the weeds by yourself, or get assist from an skilled, you may have choices.

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Reviewed for accuracy, value information, trade greatest practices, and skilled recommendation by Coty Perry.

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